GLACIERS OF PASSAGE CANAL AND BLACKSTONE BAY 353
west, everywhere excepting at the head, emphasizes the elevated position of Tebenkof Glacier which lies between the two bays and which extends nearly as far north as their mouths.
The surface of the glacier, which has no medial or lateral moraines, is exceptionally
FIG. 52. THBBNKOF GLACIER m 1910.
clean (PI. CXLII) and without morainic debris except in little patches at the terminus. It was so slightly crevassed in August, 1910, that travel over the glacier surface was very easy. The surface slopes 18° to 26°, steepening to 32° and 40° near the terminus